topic Re: Omnimcopy in background process in Operating System - HP-UX

Omnimcopy in background process

Raul Gonzalez Limon — Wed, 29 Oct 2003 09:44:39 GMT

Hi Gurus,

I make two copies of tapes into new tapes every day in background. My problem is that the log of the omnimcopy process is not being logged until omnimcopy has finished.

I have tried with stout (omnimcopy $PARAMETERS > $FILE) and with a "tee -a". But the results are the same...

Can anyone help me with this...

Thanks a lot !

Re: Omnimcopy in background process

A. Clay Stephenson — Wed, 29 Oct 2003 10:13:47 GMT

You are wasting your time. You will get no output until either the process terminates OR you get enough output to fill the buffer --- which would be many error messages. Even combining stdout and stderr onto the same file descriptor does no good. Welcome to the world of buffered output.

In case your are wondering how xomni does it, surprisingly, xomni does not actually invoke the command-line utility omnimcopy.

Re: Omnimcopy in background process

Raul Gonzalez Limon — Wed, 29 Oct 2003 10:17:47 GMT

So, i understand there is no way to do it?

Re: Omnimcopy in background process

Raul Gonzalez Limon — Wed, 29 Oct 2003 10:21:29 GMT

But then.. there is something i don't understand. Why if i do it in foreground process, it shows me the stdout in time?

Re: Omnimcopy in background process

A. Clay Stephenson — Wed, 29 Oct 2003 10:50:42 GMT

I run omnimcopy commands in the foreground and I don't get immediate output UNLESS stdout is a terminal device. In the case that stdout and stderr are determined to be tty devices then the output is line-buffered. As soon as an ASCII LF is sent, the buffer is flushed -- it shouldn't make any difference whether it is foreground or background.